I have to set my herpstat to 97F to get a 90-94 F hot spot inside the tub but I have belly heat. You will most likely never be happy with the back heat for pythons. They do better with belly heat. Were me, I would either redesign the rack to 3" 10w belly heat or sell that rack to someone with corns and use the money to buy a belly heat rack. In the mean time, you can melt holes in tubs with lots of things - hot sharp metal object works fine. I personally use a drill or dremel with 1/8 bit to make my holes. Bins never cracked and holes look clean as opposed to all melty looking. I would not set my thermostat any higher than you are going. Actually, I would never set my thermostat to a temperature that would burn me or anything else. Just seems too risky as a fire or burn hazard. Your tubs should only condensate when the snake relieves itself or when it is eating a warm prey item. My tubs also condensate when the snakes push their water bowls to the hot spot but not for any other reason.